Photographic screen.



W. C. HUEBNER. PHOTOGRAPHIG SCREEN. APPLICATION FILED DB0. 5, 191i.

1,060,982. Patented May 6, 1913.

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W. C. HUBBNER.

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In ve nto?? W. C. HUEBNBR.

PHOTOGRAPHIG SCREEN.

APPLICATION FILED DEO. 5, 1911.

Patented May 6, 1913.

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PHOTOGRAPHIG SCREEN.

APPLICATION FILED DEG. 5, 1911.

1,060,982. l Patented May 6, 1913.

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figg@ ,@7/ 61 l 6161 W. C. HUEBNE-R. PHOTOGRAPHIG SCREEN; APPLIGATLON FILED 1320.5, 1911.

Patented May 6, 1913.

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AAA A A A A UNITED sTATEs PATENT oEEioE.

WILLIAM C. HUEBNEB., 0F BUFFALO, NEW YOIR'K7 ASSIG-NOB. TO HUEBNERr-BLEISTEIN' PATENTS COMPANY, 0F BUFFALO, NEW YORK. l

PHoToGEAPHIo SCREEN.

Specification of Letters Patent.

Patented May 6,1913.

Application led December 5, l1911. Serial No. 664,017.

To all whom t may concern Be it known that I, WILLIAM C. HUEBNER, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Photo-graphic Screens, of which the following is a specification.

This invention relates to a screenrfor effecting the exposure o-f a sensitized surface by several successive fractional exposures.

The -screen area is composed of minute transparent and opaque units, so shaped and arranged around a common center that by rotating the screen about this center the screen can be turned from one position corresponding with the position of one set of units, to another position corresponding with the position of another set of units. By rotating the screen from one position to another a set of opaque units and a set of transparent units-are caused to change positions, thus exposing in each positionof the screen only those portions of the sensiti'zed surface which lieopposite transparent units and protecting those portions whichlie opposite opaque units. In' the accompanying drawings this rotatable fractional screen is represented in connection with a simple form of camera but it may be used with other stylesl of cameras and can be mounted in different ways so astobe rotatable and can be combined with various accessories, as the nature of the work may require.

Figure l is a longitudinal sectional eleval tion of a v camera provided with this im- Figs. 2, 3 and 4 are half cross sections on lines 2--2, 3-3 and 4-4, Fig. 1, respectively. Fig. 5 is a horizontal section of the rear part of the camera, partly in section, on line 5-5, Fig. 1. AFig. 6 is a fragmentary front elevation andV partial section of tuating gear. an enlarged scale, by which the screen is proved screen.

held in place. Fig.

.8 is a fragmentary side elevation of the rear part of the camera. Figs. 9-20 are views of""diiferent screens havingV units of different forms and arrangement, the units being greatly enlarged. Figs. 9'* to 20a are correspondin views each showing one group of units, still further enlarged.

the screen frame and its ac- Fig. 7 isa detached view, on of one of the spring boltsl v ing frame,

Like reference characters refer to like parts in the several figures.

A represents the stationary base of the camera having longitudinal guides 25, in the front portion of which the lens carrying standard 26 is adjustable for focusing, as usual, by means of the longitudinal adjusting screw 27. The rear portion of the base is provided with a cylindrical bearing frame B arranged concentric with the optical axis andformed o-n a supporting standard C. The frame B forms a bearing for the cylindrical screen frame D which is rotatably mounted in this bearing frame.

E represents the extensible hood which' extends from the casing 28 containing the lenses 29 rearwardly to la collar 30 which projects into the front portion of the screen frame and is secured -to the bearing frame B by arms-31 and set screw 32.

F represents the screen which may be of glass and is secured in the rear portion of thescreen frame D by a screw collar 33 or other suitable means. The screen frame is provided at the front with an annular ange 34, the front face of which is 'flush with the front face of the bearing frame B. The screen frame D is held against axial displacement in the bearing frame B by any suitable means, for instance, as shown, by spring bolts 35 'arranged radially in the bearing frameand projecting into an annular'groove 36 in the screen frame. Upon removing the rear collar 30 of the hood E from the bearing frame and withdrawing these spring' bolts, the screen frame can be withdrawn from the bearing frame. The screen frame is provided on its outer side witha gear rim 36a which is engaged by a` gear wheel 37 having its shaft 38 journaled in the standard C and provided with a hand cranlg 39 by which the wheel and through it the screen frame can 'be' rotated. The dierent positions in which the screen frame must be placed for exposing the sensitized surface and which differ withdifferent styles of screens are indicated by any suitable means, for instance, by 'a fixedmark or pointer 40 on the front side of the bear- Fig. 3, and marks 41, the front side ofl thescreen frame The three marks 41, 42, 43indicate three posi- 4 2, 43 on j j vv tions of the screen and apply to ascreen l.

having its transparent and opaque units so arranged that the screen occupies three different positions 60 degrees apart.

Gr represents the sensitized plate and H .the holder for t-he same which is inserted. from above into vertical ways z', Fig. 5 in a frame I and is provided with a handle 44. The frame is so mounted in the rear portion of the camera that itcan be moved backwardly and forwardly in order to adjust the distance at which the sensitized surface is held from the screen. The frame Iis mounted in longitudinal guides 45 in the rear portion ,of the base A and is ad-y justedv on the same by any suitable means, for instance a screw 46. and a spring 47, the screw forming an adjustable stop which limits the lforward movement lof the frame I andthe spring holding the frame yieldingly against this stop. f

The frame I can be moved backwardly.

against the pressure of the spring by means of a transverse shaft 48 having eccentrics 49 which engage against depending lugs 50 on t-he frame.

hand lever 51 which is pressed backwardly contact with the screen or so near the screen .less number o f opaque units.

to separate the sensitized surface from the screen. When the sensitized surface 1s in that the latter cannot be rotated without danger of interferingv with the sensitized surface, the latter is moved backwardly by means` of the eccentric ishaft before the screen is rotated. In making a contact exposure in which the screen is in contact with the sensitized surface the latter is required to be moved away from the screen before the latter is rotated to the next position and after the screen has been placed .in this position the sensitized surface is moved again 'into contact with the screen. The frame I is provided on lits front side with a cylindrical rib 52` arranged concentric'with the optical axis and projecting into a corresponding recess 53 in the rearv side of the bearing frame i3 forv excluding light from the sensitized surface in the vvarious `positions of the latter. rIhe position of the sensitized plate relative tothe screen can be determined by any suitable means, for instance, by a scale 54, Fig. 8, on the side of the base and an index mark 55 on the sideof the frame I in which the plate holder is mounted: The holder H for the sensitized plate is provided in its upper portin with a shutter 56 for excluding light. The screen area is composed of minute transparent and opaque units which are arranged in a regular order abo'ut a common vcenter and may be shaped and arranged -in groups in a variety of Ways, some' of which are illus'-v trated in Figs. 9-20 and 29g-20a. yThese'units are combined in groups each containing one or more transparent units and a greater v or This shaft is actuated by a Referring to the different screens and their units represented in Figs. 9-20 and 9a to 20, the screen represented in Figs. 9 and v9a has four-sided transparent units 60 and like opaque units 61, of which one transparent unit and ve opaque units form a hexagonal group. This screen is placed in six positions 60 apart, indicatedby the l numerals I, II, III,IIII, V and VI, in each of which positions one-sixthof the area of the sensitized plate is exposed through the transparent units.

The screen represented in Figs. 10 and 10 has four-sided transparent units 62 and opaque units 63 of which two transparent units and four opaque units form aheXagonal group. This screenis placed in three positions, 60 apart, indicated by the numerals I, II,.III in each of which one-third of the area of the sensitized plate is exposed.

The Vscreen represented in Figs. 1l andy 111L hasthree-Sided transparent units 64 and like opaque units 65 of which two transparent units and two opaque units form a quadrangular group. This screen is placed in two positions, 90/ apart, indicated by the numerals I and II, in each of which one-half Y of the area of the sensitized plate is exposed.

positions, 60 apart, indicated by the numerals I, II andfIII.

The screen' represented in Figs. 14 and 14a has square transparent units 70 and'like opaque units 71 of which two transparent units and two opaque units form a squarevgroup.,"This screen is placed in two positions, 90 apart,indicated by the numerals I'and, II.

The screen represented in Figs. 15 and l5 has triangular trans arent` units 72 vand similar opaque units lofwhich one transparent'unit and three opaque units form la square group. Thisscreen is placed in four positions, .90 apart, indicated by the numerals I, II, III, IIII.

168L has rhomb-shaped transparent units 74 andv similar opaqueiunits 75 of which one transparent unit andtwo opaque units form The screen represented 1n Figs. 16 and Y va hexagonal group. This screen is placed in three positions, apart, indicated by the numerals I, II, III.

numerals I, I

The screen represented inFigs. 17 and '17a has four-sidedtranspar'ent units 76 and similar opaque units 7 7 of which one transparent unit and two opaque units are com-4 bined ina triangular group. This screen is placed in three positions, 120' apart, indicated by numerals I, II, III.

The screen represented in Figs. 18 and 18a h as square transparent units 78 and similar opaque units 79 of which one transparent unit and three opaque units are combined in a square group. This screen is placed in four positions, 90 apart, indicated by the numerals I, II, HI, IIII.

The screen represented in Figs. 19 and 19a has triangular transparent units 8O and similar` opaque units 81 of which one transparent unit and five opaque units form a hexagonal4 group. This screen. is placed in six ositions, 60 apart, indicated by the inumerals I, II, III, IIII', V, YI. l 1 The screen represented in Figs. 2O and 20a Ihas three-sided transparent units 82 an similar opaqueunits 83-of which one transparent unit and two opaque units fo-rm a` triangular group. This screen is placed in three positions, 120 apart, indicated by the III. The screenI is so mounted that the center about which the screen is turned .coincides with a corner of one of the units andthe arc through which the screen is turned in passing from one posit-ion ,to another extends from the corner of one unit to` the corresponding corner of an adjacent unit. When the screen is mounted and operated in this manner a set of transparent units are caused to change-positions with a set of opaque units in turning the screen from one position to another.

In each position the screen exposes through its transparent units, numerous equally distributed points on the sensitized surface which in the aggregate cover a certain fraction of that surface, so that the several exposures through the screen in its several successive positions cover the entire area of the sensitized surface except in so far as the exposed points are separated from each other by reason of the distance between the screen and the sensitized surface or according to the opening of the -lens diaphragm. If the screen were vin actualcontact with the sensitized surface, a screen designed for two positions would expose in each position one-half of that surface, a screen designed for three positions' would expose one-third of that surface, a screen designed for four positions Would expose one-fourth of that surface, and ay screen desi' ed for six positions would expose one-l sixth df that. surface. The several exposures produce on the sensitized surface printing points which are separated more orless, as stated, and each exposure can be separately timed, as may be desired, and the operation convenience, and

-connection with n vrate negative,

' in various ways without can be repeated with the screen in each or some of the exposing positions, as may be deemed desirable. Negatives so produced when developed, fixed and dried in any suitable manner, can be used 'in black and white work in the ordinary manner of printing or reproduction and produce a finer tone gradation than can be secured by `a halftone screen of the usual kind in which the entire area of the sensitized surface is' act-ed upon or exposed at the same time except in so far as the light is excluded by the lines on the screen.

The rotary adjustment of the screen permits the'screen to be adjusted to each position quickly and with great exactness an the total effect of the successive fractional exposures is to join the same without leaving vacant spaces except in so far asthe exposed points on the negative are lseparated in order to produce proper printing points. This rotary fractional screen can also be used in color photographyl in various ways, for instance, in

color filters of various 90 kinds. This rotatable screen can also beused for printing in each position upon a sepain which case the printing from the negatives is effected by' printing one l negative after the`other, each in its appro- 95 priate position,

upon the sensitized surface.

The mechanical details of the mounting of the screen, of the devices by which the screen is rotated and of the devices by which `the sensitized plate is adjusted cankbe modified departing from the essence of the invention.

I claim as my invention:

1. The combination of a screen for the fractional exposure of a sensitized surface whiclrscreen has its area composed of transparent `units and opaque units arranged in such order about a common center that by rotating the screen about this center from one 'position to another a set-of transparent 11( units and a set of opaque units are causedto l exchange positions, and a support in which said screen is rotatable about said center, substantially as set forth.

2. The combination of -a screen for the fractional exposure of a sensitized surface which screen has-its area composed of transparent units and opaque units arranged in such order about a .common center that by rotating the screen about this center from one position to another a set of transparent units and a set of opaque units are caused to exchange positions, a support in which said screen is rotatable about said center, an means forrotating said screen, substantially 1: as set forth. f n

3. The combination with a screen having 'its area composed of transparent units and opaque units arranged in such rder about a common center located in the optical axis 1 1 ing said screen from one that by rotating the screen about this axis from one position to another a set of transparent units and a set o f opaque units are caused to exchange positions, of a cameral provided with a'bearing in which said screen is rotatably mounted, and means for rotatposition to another, substantially as set fort 4. The combination of a screen for the fractional exposure of a sensitized surface having its area composed of transparent units and opaque units arranged in such order about a common center that by rotating the screen about this center from one position to another `a set of transparent units and a set of opaque units are caused to exchange positions, a bearing in Which said screen is rotatable about said center, and a support for a sensitized plate which is adjustable toward and from the screen, substantially as set forth. g

5. The combination With a camera, of a rotatable screen having its area composed of v transparent and opaque units arranged in a regular order around the center about which the screen isrotatable, a holder for a sensitized plate arranged in rear of the screen and movable toward and `from the same, a

' stop which limits the movement of said holder toward the screen,/

holds the holder yieldingly against said stop, substantially yas set forth.

6. The combination With` a camera pro-l ing, substantially as set forth.

7. The combination-With a camera frame having its rear portion provided With a bear? ing which is concentric With the optical axis,

and a spring which.`

a rotatable screen frame arranged Within said bearing, a fractlonal screensecured 1n saidy screen frame, means for rotating said screen frame, and a hoodl having its rear end 'arranged adjacent to said screen frame, sub stantially as set forth. n

Witness my hand, thislst day of vDecember, 1911.

WILLIAM C. HUEBNER.

Witnesses: y EDWARD C. HARD, CYESTA B.- HORNBECK.y 

